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Ultrastructural histopathology of human olfactory dysfunction.

D T Moran1, B W Jafek, P M Eller

  • 1Rocky Mountain Taste and Smell Center, Department of Otolaryngology and Head and Neck Surgery, University of Colorado School of Medicine, Denver 80262.

Microscopy Research and Technique
|October 15, 1992
PubMed
Summary

Electron microscopy reveals significant olfactory epithelium damage in patients with smell loss. Traumatic and post-viral olfactory dysfunction show disrupted neuron structure and cilia loss, while congenital anosmia may involve absent olfactory epithelium.

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Area of Science:

  • Olfactory Neuroscience
  • Electron Microscopy
  • Human Pathology

Background:

  • Smell disorders, including anosmia and hyposmia, significantly impact quality of life.
  • Understanding the cellular basis of olfactory dysfunction is crucial for developing treatments.
  • Previous research has suggested structural changes in the olfactory epithelium associated with smell loss.

Purpose of the Study:

  • To investigate the ultrastructural changes in the olfactory epithelium of patients with different types of smell disorders using electron microscopy.
  • To correlate observed morphological alterations with the clinical presentation of post-traumatic anosmia, post-viral olfactory dysfunction (PVOD), and congenital anosmia.

Main Methods:

  • Electron-microscopic examination of olfactory mucosa biopsies from patients with post-traumatic anosmia/hyposmia, post-viral olfactory dysfunction (PVOD), and congenital anosmia.

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  • Detailed analysis of the cellular architecture, including supporting cells, olfactory receptor neurons, and cilia presence/integrity.

    • Main Results:

    • Post-traumatic anosmics exhibited disorganized olfactory epithelia with disrupted cellular arrangement and few olfactory cilia on receptor neurons.
    • Post-viral anosmics showed a reduced number of intact, ciliated olfactory receptor neurons, with many being aciliate; post-viral hyposmics had more intact ciliated cells.
    • Congenital anosmia cases suggested absent or greatly reduced olfactory epithelium, as no biopsies were obtained.

    Conclusions:

    • Electron microscopy reveals distinct ultrastructural pathologies in the olfactory epithelium underlying different smell loss conditions.
    • Damage to olfactory receptor neurons and cilia is a common feature in traumatic and viral-induced smell dysfunction.
    • Congenital anosmia may be characterized by the absence or severe underdevelopment of the olfactory epithelium.